Brittle crack arrest properties in ship construction have become more important as shipbuilding steel plates become thicker and stronger. There have been indications that steel toughness can have the effect of arresting brittle crack initiating in a welded joint; however T-weld joints of an actual large structure has not been well investigated. In this report, the brittle crack length and steel toughness were found to affect brittle crack arrest behavior. Furthermore, it was suggested that a horizontal plate with sufficiently large can arrest brittle cracks even for the T-weld joint of an actual large-scale structure.
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